In "My mistress' eyes are nothing like the sun", What conventional images does Shakespeare use to express love?

You have to remember that unlike other poets of the day, Shakespeare does not use conventional images to describe his love, but rather to show us what she is not. In this sonnet, he parodies the Petrarchan sonnet, and he makes clear that even without conventional beauty, his mistress is an object of love.

Thus, you need to understand that the "mistress" does not have the following attributes....

sprakling eyes, ruby red lips, snow white skin, cheeks like roses, sweet breath, musical voice, graceful movements